/* ioapi.h -- IO base function header for compress/uncompress .zip
   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )

   Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )

   Modifications for Zip64 support
   Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )

   For more info read MiniZip_info.txt

*/

#ifdef _WIN32
#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#endif

#include "ioapi.h"

voidpf call_zopen64 (const zlib_filefunc64_32_def* pfilefunc,const void*filename,int mode)
{
   if (pfilefunc->zfile_func64.zopen64_file != NULL)
      return (*(pfilefunc->zfile_func64.zopen64_file)) (pfilefunc->zfile_func64.opaque,filename,mode);
   else
   {
      return (*(pfilefunc->zopen32_file))(pfilefunc->zfile_func64.opaque,(const char*)filename,mode);
   }
}

long call_zseek64 (const zlib_filefunc64_32_def* pfilefunc,voidpf filestream, ZPOS64_T offset, int origin)
{
   if (pfilefunc->zfile_func64.zseek64_file != NULL)
      return (*(pfilefunc->zfile_func64.zseek64_file)) (pfilefunc->zfile_func64.opaque,filestream,offset,origin);
   else
   {
      uLong offsetTruncated = (uLong)offset;
      if (offsetTruncated != offset)
         return -1;
      else
         return (*(pfilefunc->zseek32_file))(pfilefunc->zfile_func64.opaque,filestream,offsetTruncated,origin);
   }
}

ZPOS64_T call_ztell64 (const zlib_filefunc64_32_def* pfilefunc,voidpf filestream)
{
   if (pfilefunc->zfile_func64.zseek64_file != NULL)
      return (*(pfilefunc->zfile_func64.ztell64_file)) (pfilefunc->zfile_func64.opaque,filestream);
   else
   {
      uLong tell_uLong = (*(pfilefunc->ztell32_file))(pfilefunc->zfile_func64.opaque,filestream);
      if ((tell_uLong) == ((uLong)-1))
         return (ZPOS64_T)-1;
      else
         return tell_uLong;
   }
}

void fill_zlib_filefunc64_32_def_from_filefunc32(zlib_filefunc64_32_def* p_filefunc64_32,const zlib_filefunc_def* p_filefunc32)
{
   p_filefunc64_32->zfile_func64.zopen64_file = NULL;
   p_filefunc64_32->zopen32_file = p_filefunc32->zopen_file;
   p_filefunc64_32->zfile_func64.zerror_file = p_filefunc32->zerror_file;
   p_filefunc64_32->zfile_func64.zread_file = p_filefunc32->zread_file;
   p_filefunc64_32->zfile_func64.zwrite_file = p_filefunc32->zwrite_file;
   p_filefunc64_32->zfile_func64.ztell64_file = NULL;
   p_filefunc64_32->zfile_func64.zseek64_file = NULL;
   p_filefunc64_32->zfile_func64.zclose_file = p_filefunc32->zclose_file;
   p_filefunc64_32->zfile_func64.zerror_file = p_filefunc32->zerror_file;
   p_filefunc64_32->zfile_func64.opaque = p_filefunc32->opaque;
   p_filefunc64_32->zseek32_file = p_filefunc32->zseek_file;
   p_filefunc64_32->ztell32_file = p_filefunc32->ztell_file;
}



static voidpf  ZCALLBACK fopen_file_func OF((voidpf opaque, const char* filename, int mode));
static uLong   ZCALLBACK fread_file_func OF((voidpf opaque, voidpf stream, void* buf, uLong size));
static uLong   ZCALLBACK fwrite_file_func OF((voidpf opaque, voidpf stream, const void* buf,uLong size));
static ZPOS64_T ZCALLBACK ftell64_file_func OF((voidpf opaque, voidpf stream));
static long    ZCALLBACK fseek64_file_func OF((voidpf opaque, voidpf stream, ZPOS64_T offset, int origin));
static int     ZCALLBACK fclose_file_func OF((voidpf opaque, voidpf stream));
static int     ZCALLBACK ferror_file_func OF((voidpf opaque, voidpf stream));

static voidpf ZCALLBACK fopen_file_func (voidpf opaque, const char* filename, int mode)
{
   FILE* file = NULL;
   const char* mode_fopen = NULL;
   if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
      mode_fopen = "rb";
   else
      if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
         mode_fopen = "r+b";
      else
         if (mode & ZLIB_FILEFUNC_MODE_CREATE)
            mode_fopen = "wb";

   if ((filename!=NULL) && (mode_fopen != NULL))
      file = fopen(filename, mode_fopen);
   return file;
}

static voidpf ZCALLBACK fopen64_file_func (voidpf opaque, const void* filename, int mode)
{
   FILE* file = NULL;
   const char* mode_fopen = NULL;
   if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
      mode_fopen = "rb";
   else
      if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
         mode_fopen = "r+b";
      else
         if (mode & ZLIB_FILEFUNC_MODE_CREATE)
            mode_fopen = "wb";

   if ((filename!=NULL) && (mode_fopen != NULL))
      file = fopen((const char*)filename, mode_fopen);
   return file;
}


static uLong ZCALLBACK fread_file_func (voidpf opaque, voidpf stream, void* buf, uLong size)
{
   uLong ret;
   ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream);
   return ret;
}

static uLong ZCALLBACK fwrite_file_func (voidpf opaque, voidpf stream, const void* buf, uLong size)
{
   uLong ret;
   ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream);
   return ret;
}

static long ZCALLBACK ftell_file_func (voidpf opaque, voidpf stream)
{
   long ret;
   ret = ftell((FILE *)stream);
   return ret;
}


static ZPOS64_T ZCALLBACK ftell64_file_func (voidpf opaque, voidpf stream)
{
   ZPOS64_T ret;
   ret = ftell((FILE *)stream);
   return ret;
}

static long ZCALLBACK fseek_file_func (voidpf  opaque, voidpf stream, uLong offset, int origin)
{
   int fseek_origin=0;
   long ret;
   switch (origin)
   {
      case ZLIB_FILEFUNC_SEEK_CUR :
         fseek_origin = SEEK_CUR;
         break;
      case ZLIB_FILEFUNC_SEEK_END :
         fseek_origin = SEEK_END;
         break;
      case ZLIB_FILEFUNC_SEEK_SET :
         fseek_origin = SEEK_SET;
         break;
      default: return -1;
   }
   ret = 0;
   if (fseek((FILE *)stream, offset, fseek_origin) != 0)
      ret = -1;
   return ret;
}

static long ZCALLBACK fseek64_file_func (voidpf  opaque, voidpf stream, ZPOS64_T offset, int origin)
{
   int fseek_origin=0;
   long ret;
   switch (origin)
   {
      case ZLIB_FILEFUNC_SEEK_CUR :
         fseek_origin = SEEK_CUR;
         break;
      case ZLIB_FILEFUNC_SEEK_END :
         fseek_origin = SEEK_END;
         break;
      case ZLIB_FILEFUNC_SEEK_SET :
         fseek_origin = SEEK_SET;
         break;
      default: return -1;
   }
   ret = 0;

   if(fseek((FILE *)stream, (long)offset, fseek_origin) != 0)
      ret = -1;

   return ret;
}


static int ZCALLBACK fclose_file_func (voidpf opaque, voidpf stream)
{
   int ret;
   ret = fclose((FILE *)stream);
   return ret;
}

static int ZCALLBACK ferror_file_func (voidpf opaque, voidpf stream)
{
   int ret;
   ret = ferror((FILE *)stream);
   return ret;
}

void fill_fopen_filefunc (zlib_filefunc_def *pzlib_filefunc_def)
{
   pzlib_filefunc_def->zopen_file = fopen_file_func;
   pzlib_filefunc_def->zread_file = fread_file_func;
   pzlib_filefunc_def->zwrite_file = fwrite_file_func;
   pzlib_filefunc_def->ztell_file = ftell_file_func;
   pzlib_filefunc_def->zseek_file = fseek_file_func;
   pzlib_filefunc_def->zclose_file = fclose_file_func;
   pzlib_filefunc_def->zerror_file = ferror_file_func;
   pzlib_filefunc_def->opaque = NULL;
}

void fill_fopen64_filefunc (zlib_filefunc64_def*  pzlib_filefunc_def)
{
   pzlib_filefunc_def->zopen64_file = fopen64_file_func;
   pzlib_filefunc_def->zread_file = fread_file_func;
   pzlib_filefunc_def->zwrite_file = fwrite_file_func;
   pzlib_filefunc_def->ztell64_file = ftell64_file_func;
   pzlib_filefunc_def->zseek64_file = fseek64_file_func;
   pzlib_filefunc_def->zclose_file = fclose_file_func;
   pzlib_filefunc_def->zerror_file = ferror_file_func;
   pzlib_filefunc_def->opaque = NULL;
}
